Bit of a twist on the flappy bird formula.
I like the idea of collecting a bubble for a shield. Unfortunately the collision detection is way off.
I assume you are using a hit box, make it a a bit smaller, otherwise the player feels cheated and will get frustrated and lose interest.
I also noticed a slight bug where a tap would send the fish right to the top of the screen unexpectedly.

Because this was my first serious game for iOS I kept it simple. I think the result was good and addictive. I am doing some changes for release 1.1. One is to make easier in the beginning (by request) and some minor adjustments to make it more fun. Any suggestions are welcome! #

* "wom wom wom" starfish sound was not stopping, some times, on gameOver;
* some elements on the "game over" screen were partially covered;
* game now starts easy and gets hard with time;
* some minor adjustments;

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